How you register to use a floating license will depend on how floating licenses are managed in your organization.
If all the machines sharing a pool of floating licenses are on the same network segment, you will register your licence the same way you register a named-user licence.
If the machines sharing the pool of floating licenses are on different network segments, someone in your company will need to set up a license server. Consult that person to determine if they have set up a license server as a standalone process or as a Java servlet as the registration process is different for each.